Revision 89a8640279f8bb78aaf778d1fc5c4a6778f18064 authored by David Howells on 30 October 2009, 13:13:26 UTC, committed by Linus Torvalds on 31 October 2009, 19:11:37 UTC
Don't pass NULL pointers to fput() in the error handling paths of the NOMMU
do_mmap_pgoff() as it can't handle it.

The following can be used as a test program:

	int main() { static long long a[1024 * 1024 * 20] = { 0 }; return a;}

Without the patch, the code oopses in atomic_long_dec_and_test() as called by
fput() after the kernel complains that it can't allocate that big a chunk of
memory.  With the patch, the kernel just complains about the allocation size
and then the program segfaults during execve() as execve() can't complete the
allocation of all the new ELF program segments.

Reported-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Robin Getz <rgetz@blackfin.uclinux.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 2e2ec95
Raw File
netevent.h
#ifndef _NET_EVENT_H
#define _NET_EVENT_H

/*
 *	Generic netevent notifiers
 *
 *	Authors:
 *      Tom Tucker              <tom@opengridcomputing.com>
 *      Steve Wise              <swise@opengridcomputing.com>
 *
 * 	Changes:
 */
#ifdef __KERNEL__

struct dst_entry;

struct netevent_redirect {
	struct dst_entry *old;
	struct dst_entry *new;
};

enum netevent_notif_type {
	NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */
	NETEVENT_PMTU_UPDATE,	   /* arg is struct dst_entry ptr */
	NETEVENT_REDIRECT,	   /* arg is struct netevent_redirect ptr */
};

extern int register_netevent_notifier(struct notifier_block *nb);
extern int unregister_netevent_notifier(struct notifier_block *nb);
extern int call_netevent_notifiers(unsigned long val, void *v);

#endif
#endif
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